$O_{2}$ exchange with $CO_{2}$ by simple diffusion over the entire body surface takes place in:
$I.$ Sponges
$II.$ Coelenterates
$III.$ Flatworms
Select the correct option to complete the given statement.

  • A
    $I$ and $II$
  • B
    $II$ and $III$
  • C
    $I$ and $III$
  • D
    All of the above

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